Alternate title

Date ( Publication )

2011-05-20T03:00:00

Purpose

The CombiSD DNA022 sensor includes, in a single apparatus, the both transducers for measuring wind speed and wind direction. Its use simplifies the installation and the plant design in respect of the sensors with separate measurements plus giving some other advantages being smaller, lighter and cheaper.

The purpose of this resource in Pheriche station is to acquire data on:

- wind speed

- wind direction

Status

Completed

Maintenance and update frequency

As needed

GEMET ( Theme )

• thermal power plant

Keywords

• SHARE , Network , Station , High Altitude

Keywords

• CEOP

Keywords ( Place )

• Nepal , Pheriche , Khumbu Valley , Sagarmatha National Park

Keywords ( Theme )

• wind speed , wind direction

Use limitation

No conditions apply

Access constraints

Copyright

Other constraints

Character set

UTF8

Topic category

• Climatology, meteorology, atmosphere
• Environment
• Geoscientific information

Supplemental Information

Reference system identifier

EPSG / WGS 84 (EPSG:4326) / 7.4

Topology level

Geometry only

Geometric object type

Point

Geometric object count

1

OnLine resource

Himalayas Reference Site Pheriche Station  

Himalayas Reference Site Pheriche Station

OnLine resource

https://geoportal.mountaingenius.org/geonetwork/srv/api/records/db21773f-536a-488e-8b9d-06040fd111d9/attachments/Data%20Usage%20Policy.pdf  

Hierarchy level

Series

Statement

Wind velocity is a three-dimensional vector quantity with small-scale random fluctuations in space and time superimposed upon a larger-scale organized flow. It is considered in this form in relation to, for example, airborne pollution and the landing of aircraft. The WMO Guide will be considered surface wind as a twodimensional vector quantity specified by two numbers representing direction and speed. The extent to which wind is characterized by rapid fluctuations is referred to as gustiness, and single fluctuations are called gusts.

The station was installed on October 2001. The instrument is mounted on a 5m mast.

The CombiSD sensor includes, in a single apparatus, the both transducers for measuring wind speed and wind direction. Its use simplifies the installation and the plant design in respect of the sensors with separate measurements plus giving some other advantages being smaller, lighter and cheaper.

The CombiSD sensor is available in different versions:

-DNA021-022: sensors with direct signal output. Frequency (Hz) for

wind speed and resistance (Ohm) for wind direction.

These sensors are suitable for acqusition systems, as LSI-LASTEM ones, able to

recognise and manage this kind of electrical output. DNA022 model has low power consumption, it can be used in systems with small energy availability.

Principle of operation:3 cups and vane

anemometer

Speed sensor: Optoelectronic disk

Direction sensor:2000 Ohm wire potentiometer

The technical characteristics are:

- Principle of operation: 3 cups and vane anemometer

- Speed sensor: Optoelectronic disk

- Direction sensor: 2000 Ohm wire potentiometer / Positioning Hall effect sensor

- Housing: Heavy gauge anodised aluminium

- Shaft carriers: Low-torque stainless steel bearings

- Protection (vertical position): IP65

- Mechanical mounting: On 48 50 mm diameter mast

- Electrical outlet terminators: IP65 watertight connector

- Weight (instrument with rotors): 950 gr.

The Physical and operational specification are:

- damage threshold > 75 m/s

- operating temperature: -30°+70°C

The speed measures are specified by:

- Measurement range: 0-60 m/s (using transfer function)

- Threshold: 0,21 m/s

- Response time (63% at 5 m/s): 0.8 s

- Distance constant (delay distance) at 5 m/s: 4 m

- Resolution (integration time=1s): 0.05 m/s

- Accuracy & Linearity: 0,1 m/s+1%VL (readout), if connected to LASTEM data loggers.

The direction measures are specified by:

- Measurement range: 0 ÷ 360

- Threshold: 0,15 m/s

- Response time (at 5 m/s): 0,26 s

- Delay distance (at 5 m/s): 1,32 m

- Damping coefficient (VDI3786): 0,21

- Transfer function: Dir(°)= 355 x R(Ohm)/2000

- Resolution: 0,1

- Accuracy: 1% FS (Full scale)

- Integral linearity: 0,5%

gmd:MD_Metadata

File identifier

db21773f-536a-488e-8b9d-06040fd111d9   XML

Metadata language

eng

Character set

UTF8

Parent identifier

fa538866-39e0-47b5-b048-980e1821bd68

Hierarchy level

Series

Date stamp

2025-01-21T08:49:07

Metadata standard name

ISO 19115:2003/19139

Metadata standard version

1.0